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Mon, 19 Aug 2019 01:11:53 -0700 (PDT) Received: from xz-x1 ([209.132.188.80]) by smtp.gmail.com with ESMTPSA id 185sm22329016pff.54.2019.08.19.01.11.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 19 Aug 2019 01:11:53 -0700 (PDT) Date: Mon, 19 Aug 2019 16:11:43 +0800 From: Peter Xu To: Eric Auger Message-ID: <20190819081143.GA13560@xz-x1> References: <20190730172137.23114-1-eric.auger@redhat.com> <20190730172137.23114-9-eric.auger@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20190730172137.23114-9-eric.auger@redhat.com> User-Agent: Mutt/1.11.4 (2019-03-13) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: Re: [Qemu-devel] [PATCH for-4.2 v10 08/15] virtio-iommu: Implement map/unmap X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peter.maydell@linaro.org, kevin.tian@intel.com, mst@redhat.com, tn@semihalf.com, qemu-devel@nongnu.org, alex.williamson@redhat.com, qemu-arm@nongnu.org, jean-philippe@linaro.org, bharat.bhushan@nxp.com, eric.auger.pro@gmail.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Tue, Jul 30, 2019 at 07:21:30PM +0200, Eric Auger wrote: [...] > + mapping = g_tree_lookup(domain->mappings, (gpointer)(&interval)); > + > + while (mapping) { > + viommu_interval current; > + uint64_t low = mapping->virt_addr; > + uint64_t high = mapping->virt_addr + mapping->size - 1; > + > + current.low = low; > + current.high = high; > + > + if (low == interval.low && size >= mapping->size) { > + g_tree_remove(domain->mappings, (gpointer)(¤t)); > + interval.low = high + 1; > + trace_virtio_iommu_unmap_left_interval(current.low, current.high, > + interval.low, interval.high); > + } else if (high == interval.high && size >= mapping->size) { > + trace_virtio_iommu_unmap_right_interval(current.low, current.high, > + interval.low, interval.high); > + g_tree_remove(domain->mappings, (gpointer)(¤t)); > + interval.high = low - 1; > + } else if (low > interval.low && high < interval.high) { > + trace_virtio_iommu_unmap_inc_interval(current.low, current.high); > + g_tree_remove(domain->mappings, (gpointer)(¤t)); > + } else { > + break; > + } > + if (interval.low >= interval.high) { > + return VIRTIO_IOMMU_S_OK; > + } else { > + mapping = g_tree_lookup(domain->mappings, (gpointer)(&interval)); > + } > + } > + > + if (mapping) { > + qemu_log_mask(LOG_GUEST_ERROR, > + "****** %s: Unmap 0x%"PRIx64" size=0x%"PRIx64 > + " from 0x%"PRIx64" size=0x%"PRIx64" is not supported\n", > + __func__, interval.low, size, > + mapping->virt_addr, mapping->size); > + } else { > + return VIRTIO_IOMMU_S_OK; > + } > + > + return VIRTIO_IOMMU_S_INVAL; Could the above chunk be simplified as something like below? while ((mapping = g_tree_lookup(domain->mappings, &interval))) { g_tree_remove(domain->mappings, mapping); } Thanks, -- Peter Xu